/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Scene/SceneCapturePhotoSet.h
If enabled, any Component Scene Proxies in the level that are not meant to be included in the capture (ie not added via SetCaptureSceneActors), will be unregistered to hide them. This is generally not necessary, and disabled by default, but in some cases the Renderer may not be able to fully exclude the effects of an object via hidden/visible flags.
void SetEnableVisibilityByUnregisterMode ( bool bEnable )